Curium (Cm) is a highly radioactive actinide metal. Its reaction with water is very vigorous and exothermic. Here's a breakdown of what happens:

Reaction:

Curium reacts with water to form curium hydroxide (Cm(OH)₃) and hydrogen gas (H₂). The reaction can be represented as:

2 Cm + 6 H₂O → 2 Cm(OH)₃ + 3 H₂

Key points:

* Highly reactive: Curium is extremely reactive with water due to its high electronegativity and its tendency to lose electrons.

* Exothermic: The reaction releases a significant amount of heat, making it highly dangerous.

* Hydrogen gas production: The release of hydrogen gas is a major safety concern, as it is highly flammable and can form explosive mixtures with air.

* Radioactive hazards: Curium is highly radioactive, and its reaction with water can lead to the release of radioactive particles into the environment.

Safety:

Due to the extreme reactivity and radioactive nature of curium, it is essential to handle it with utmost caution in a controlled environment. Special equipment and procedures are required to safely handle and store this element.

In summary:

Curium's reaction with water is a highly dangerous process due to its vigorous nature, exothermic heat production, hydrogen gas generation, and radioactive hazards.